gecko/content/canvas/test/test_2d.imageData.get.source.negative.html

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<!DOCTYPE HTML>
<title>Canvas test: 2d.imageData.get.source.negative</title>
<!-- Testing: getImageData() works with negative width and height -->
<script src="/MochiKit/MochiKit.js"></script>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css">
<body>
<canvas id="c" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
<script>
SimpleTest.waitForExplicitFinish();
MochiKit.DOM.addLoadEvent(function () {
var canvas = document.getElementById('c');
var ctx = canvas.getContext('2d');
var _thrown_outer = false;
try {
ctx.fillStyle = '#000';
ctx.fillRect(0, 0, 100, 50);
ctx.fillStyle = '#fff';
ctx.fillRect(20, 10, 60, 10);
var imgdata1 = ctx.getImageData(85, 25, -10, -10);
ok(imgdata1.data[0] === 0, "imgdata1.data[\""+(0)+"\"] === 0");
ok(imgdata1.data[1] === 0, "imgdata1.data[\""+(1)+"\"] === 0");
ok(imgdata1.data[2] === 0, "imgdata1.data[\""+(2)+"\"] === 0");
ok(imgdata1.data[3] === 255, "imgdata1.data[\""+(3)+"\"] === 255");
ok(imgdata1.data[imgdata1.length-4+0] === 255, "imgdata1.data[imgdata1.length-4+0] === 255");
ok(imgdata1.data[imgdata1.length-4+1] === 255, "imgdata1.data[imgdata1.length-4+1] === 255");
ok(imgdata1.data[imgdata1.length-4+2] === 255, "imgdata1.data[imgdata1.length-4+2] === 255");
ok(imgdata1.data[imgdata1.length-4+3] === 255, "imgdata1.data[imgdata1.length-4+3] === 255");
var imgdata2 = ctx.getImageData(0, 0, -1, -1);
ok(imgdata2.data[0] === 0, "imgdata2.data[\""+(0)+"\"] === 0");
ok(imgdata2.data[1] === 0, "imgdata2.data[\""+(1)+"\"] === 0");
ok(imgdata2.data[2] === 0, "imgdata2.data[\""+(2)+"\"] === 0");
ok(imgdata2.data[3] === 0, "imgdata2.data[\""+(3)+"\"] === 0");
} catch (e) {
_thrown_outer = true;
}
todo(!_thrown_outer, 'should not throw exception');
SimpleTest.finish();
});
</script>